Transmission operating mechanism



May 22, 1951 H. w. PRICE TRANSMISSION OPERATING MECHANISM 6 Sheets-Sheet 1 Filed Jan. 13, 1943 mvsnrroz. HAROLD W PRICE May 22, 1951 H. w. PRICE TRANSMISSION OPERATING MECHANISM 6 Sheets-Sheet 2 Filed Jan. 13, 1943 INVENTOE. HAROLD w PIP/CE May 22, 1951 H. w. PRICE TRANSMISSION 'OPERATING MECHANISM 6 Sheets-Sheet 3 Filed Jan. 13. 1943 QWN mmN emu m m m m HAROLD W PIP/CE May 22, 1951 H. w. PRICE TRANSMISSION OPERATING MECHANISM 6 Sheets-Sheet 4 Filed Jan. 13, 1945 an I , INVENTOR. HAROLD W PE/CE May 22, 1951 H. w. PRICE TRANSMISSION OPERATING MECHANISM 6 Sheets-Sheet 5 Filed Jan. 13. 1945 IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII i [Ill/II!IIIIIIIIIIIIIIIIIIIIIIIIIIIJ 'IWIIIJL l INVENTOR HAROLD W FfP/CE May 22, 1951 Filed Jan. 13, 1943 H. W. PRICE TRANSMISSION OPERATING MECHANISM 6 Sheets-Sheet 6 INVENTOR.

HAROLD W /c5 Patented May 22, 1951 TRANSMISSION OPERATING MECHANISM Harold W. Price, South Bend, Ind., assignor to Bendix Aviation Corporation, South Bend, Ind., a, corporation of Delaware Application January 13, 1943, Serial No. 472,199

7 Claims. (Cl. 74-335) This invention relates in general to transmission operating mechanism and more particularly to means for operating a six speeds for-ward and two speeds reverse transmission mechanism constituting a part of the power plant Of a motor vehicle.

One of the objects of my invention is to provide an improved selector and actuating mechanism for obtaining the several speed ratios provided by the speed changing mechanism of a tank used for military purposes. It is apparent, however, that the transmission operating mechanism constituting my invention is not limited to use in a tank, for said mechanism may, with no changes in construction, be used to operate the change-speed transmission of an automotive vehicle.

My invention also contemplates the provision of means, including a plurality of pressure differential operated motors, for operating the changespeed transmission mechanism of a motor vehicle, said mechanism being capable of being established in any one of six forward speed. settings or in either one of two reverse speed settings and said mechanism including three separate nests of gears or transmission units, the gears of each nest beinng operable to either establish one or the other of two gear ratio settings.

Yet another object of my invention to is to provide means for operating a six speeds forward and two speeds reverse transmission mechanism of a motor vehicle, said transmission mechanism.

including three separate cranks extending from the casing of the transmission; and further object of my invention is to provide three separate force transmitting means for operating the aforementioned three cranks and also to provide a manually operable selector lever mechanism and interlock mechanism for operating and controlling the operation of said force transmitting means, the parts of said lever and interlock mechanism being so constructed and arranged and so operative that one of said cranks and one or the other of two of said cranks are actuated before the remaining crank may be actuated.

A further object of my invention is to soccnstruct and arrange the parts of the transmission operating mechanism constituting my invention that one or the other of two of the nests of gears of the aforementioned transmission mechanism may be operated to establish a gear ratio setting when and only When the other of said nests of gears is neutralized.

Yet another object of my invention is to provide power and manually operated means for operating the change-speed transmission mechanism of a motor vehicle, said mechanism having six diiierent forward speed settings and two different reverse gear settings and including among its parts three separate cranks extending from the casing of the transmission mechanism. A further object of my invention is to include in said operating mechanism a manually operable lever member having an H-movement.

An additional object of my invention is to provide means for operating a six speeds forward and two speeds reverse transmission including a plurality of transmission units, said means including one lever member movable in a plurality ofdifferent planes and further including another lever member movable in but one plane; and a further object of my invention is to so construct the connections between said levers and the transmission mechanism as to make it impossible to move the latter lever to establish one of the transmission units in gear until the former lever is moved to neutralize another of the transmission units.

Yet another object of my invention is to provide power means for operating a multi-speed transmission mechanism of a motor vehicle, said power means including a plurality of pressure differential operated motors, a selector lever, a follow-up valve for controlling the operation of each motor and means 50 interconnecting the selector lever, transmission mechanism, valve, and the power element of each motor that the operator in moving the selector lever to operate the transmission mechanism encounters a resistance or feel which is directly proportional to the transmission operating force exerted by the pressure differential operated motor in operation.

Yet another object of my invention is to provide, in the power plant of a motor vehicle, means for operating three different transmission units or nests of gears of a six speeds forward and two speeds reverse transmission mechanism, said means including three separate cranks extending from the casing of the transmission mechanism, two manually operated selector levers positioned adjacent the drivers seat of the vehicle and three separate force transmitting means interconnecting said cranks and levers.

A further object of my invention resides in the provision of an improved selector control mechanism for use with a change-speed transmission having eight different gear ratio settings, said mechanism being adapted for manual control with a minimum of effort and a, maximum of safety to the operating parts. Yet another object of my invention is to so construct said selector control mechanism that the same is manipulated with a minimum of effort and attention on the part of the driver thereby increasing the safety of vehicle driving and the comfort of the driver.

Another object of the invention is to provide means, including a selector lever member positioned adjacent the driver of a motor vehicle and having an H-movement, for operating a change-speed transmission mechanism which may, by the operation of twocranks, be established in any one of three forward gear settings or a reverse gear setting and which may then, by the operation of another crank, be established in one or the other of two settings thereby providing a transmission capable of being established in any one of six forward gear settingsor either one or the other of two reverse gear settings.

Other objects of the invention and desirable details of construction of parts will become apparent from the following detailed description of certain embodimentsof the invention, taken in conjunction with the accompanying drawings illustrating said embodiments, in which:

Figure 1 is a perspective view diagrammatic in form illustrating my transmission operating mechanism incorporated in the power plant of a tank;

Figure 2 is a view, somewhat diagrammatic in form, disclosing one embodiment of the transmission operating mechanism constituting my invention;

Figure 3 is a view, similar to Figure 2, disclosing another embodiment of the transmission operating mechanism constituting my invention;

Figure 4 is a view, similar to Figures 2 and 3 disclosing the preferred embodiment of the transmission operating mechanism constitutin my invention;

Figure 5 is a sectional view, taken on the line 5-5 of Figure 4, disclosing in detail a portion of the selector lever mechanism constituting the invention disclosed in Figure 4;

Figure 6 is a sectional View, taken on the line 66 of Figure 2 disclosing details of the interlock mechanism of the invention disclosed in the latter figure;

Figure 7 is a vertical sectional view taken through a portion of the transmission operating means disclosed in Figure 3 and disclosing the details of the interlock mechanism;

Figure 8 is a sectional view, taken on the line 88 of Figure 2, disclosing a part of the linkage interconnecting a part of the selector lever mechanism, a part of the transmission mechanism and a pressure differential operated motor, said linkage serving to effect the follow-up operation of the control valve of said motor and also to efiect the so-called feel of the mechanism;

Figure 9 is a longitudinal sectional view disclosing the details of one of the pressure differential operated motors of the transmission operating mechanism constituting my invention, the piston, that is power element of said motor, and the parts of the control valve of said motor being in their transmission neutral position;

Figure 10 is a view similar to Figure 9 disclosing the power element of the pressure differential operated motor in one ofits operative positions, that is in'one of its gear established positions;

Figure 11 is a view, similar to Figure 10, dieclosing the power element of the-pressure differential operated motor in the other of its ear established positions; and

Figure 12 is a plan view of one form of six speeds forward and two speeds reverse transmission, which transmission is operated by the transmission operating mechanism constituting my in- Vention.

Referring now to Figure 1 there is disclosed in this figure a portion of the power plant of a military tank, said power plant including the transmission operating mechanism constituting my invention. It is to be understood, however, that my invention is not limited in its use to a tank; for it is obvious that both the changespeed transmission If! and the means for operating it, all as disclosed in Figure 1, might be incorporated in the power plant of an automotive vehicle, i. e. a bus or a heavy-duty truck.

Completing the description of the power plant disclosed in Figure 1, the driver is seated in a seat l2 immediately to the rear of a steering wheel I4. A manually operated clutch pedal 16, serves through the intermediary of a hydraulic master cylinder i8 and fluid transmitting conduits l9 to control the operation of a hydraulic and vacuum operated motor 20, said motor serving, through the intermediary of a hydraulic slave cylinder 22, to operate a clutch mechanism, not shown, actuated by a crank 26. This clutch mechanism, preferably of the friction type, serves to interconnect an internal combustion engine 28 with the aforementioned six speeds forward and two speeds reverse transmission disclosed in detail in Figure 12. The accelerator 28 Which may be operated by the right foot of the driver, serves, by means of a link 30 and a crank 32, to operate a hydraulic master cylinder 3d, the latter being connected, by a fluid transmitting conduit 36, with a throttle operating hydraulic slave cylinder 38. The throttle mechanism, not shown, operated by the cylinder 38, constitutes a part of the means for controlling the operation of the engine 26. The clutch and throttle master cylinders l8 and 3t may be supplied withv their power fluid from a fluid reservoir til;

If desired, the tank may, as disclosed in Figure 1, be provided with a supplementary set of controls mounted adjacent an assistant drivers seat 42. These controls preferably include a steering wheel a l, a clutch pedal 46 and an accelerator 48 connected respectively with the above described steering wheel l l, clutch pedal l6 and accelerator 28. The clutch and throttle controls of the driver and assistant driver are shown mechanically interconnected. A cannon 5?! is shown extending from an opening in a turret 5i and the tank is of course also armed with machine guns, not shown.

The power plant of the tank disclosed in Figure 1 has only been briefly described inasmuch as my invention resides in the hereinafter described and claimed mechanism, three embodiments of which are disclosed in the drawings, for operating a six speeds forward and two speeds reverse transmission, such for example as the transmission disclosed in Figure 12.

Describing now this transmission mechanism, the same consists of three separate nests of gears or transmission units indicated generally by the reference numerals 52, Hand 56. No claim is made to the transmission-disclosed in Figure 12; accordingly, the same is only briefly described. The nest of gears or unit 52 may consist of two planetary gear units controlled by a sliding gear 58, movable, by means of a crank 6|], Figures 2 and 12, to establish the transmission unit 52 either in high gear or low gear or in neutral. As disclosed in Figure 2 the crank til is connected to the upper end of a shaft 64 and this shaft is journalled in bearings, not shown. To the lower end of the shaft 64 there is connected a crank 66 extending outside the casing of the trans mission. As disclosed in Figure 12 the transmission unit 52 serves to interconnect the internal combustion engine 2'6 with the transmission units 54 and 58 and the unit 52 is neutralized, by the hereinafter described transmission operating mechanism constituting my invention, before either of the transmission units-'55 or 55 is neutralized preliminary to the operation of establishing the remaining unit in gear.

The transmission unit 52 is connected to the transmission units or nests of gears 5 and 55 by means of a pinion 68, ring gears I'd and 12 meshed with said pinion and shafts M and it connected respectively with the gears it and E2. The nest of gears 54 includes gears I8 and as rotatably mounted on the shaft '55 and a gear member 82 slidably mounted and drivably connected with said shaft. The gears 78 and 8d are meshed with gears B l and 36 respectively, the

latter gears being drivably connected to a drive shaft 83 which is coupled at one of its ends with a magnetic slip clutch and final drive 89 and at its other end with a similar drive mechanism, not shown. The sliding gear 82 isactuated by means of a crank '90 forked at its end to embrace the gear, all as disclosed in Figures 2 and 12. As disclosed in Figure 2 the crank 98 is connected to the upper end of a shaft 92 and this shaft is journalled in bearings, not shown. To the lower end of the shaft 92 there is connected a crank 94 lying outside the casing of the transmission. To operate the transmission unit iii: the crank $8 is rotated to mesh the gear 82 with the gear80 to establish the unit in its high gear setting, or mesh the gear 82 with the gear iii to establish the unit in its low gear setting or position the gear 82 in its transmission neutral position as disclosed in Figure 12, that is in position between the gears 18 and Bi] and out of mesh therewith.

Briefly describing the transmission unit 56 the same includes a sliding gear 93 slidably mounted on and drivably connected with the shaft 14, said gear being either moved into mesh with an idler gear 98 to effect a low gear setting of the transmission unit or into mesh with a gear I06 to effect a reverse gear setting of the transmission unit. The idler gear 98 is in constant mesh with a gear IE2 drivably connected with the drive shaft 88. The nest of gears 5'0 are shown diagrammatically in Figure 12, the idler gear 98 being shown out of its true position, that is a position beneath the gear It'll where it may be meshed with the sliding gear 95. The latter gear is preferably operated by the forked end of a crank Ill i, Figures 2 and 12, and is shown in its transmission neutral position in Figure 1 that is a position where it is out of mesh with both the gear mo and the gear I32. As disclosed in Figure 2 the crank Iil l is connected to the upper end of a shaft IDS journalled in bearings, not shown. .To the lower end of the shaft there is connected a crank Hi8 lying outside the casing of the transmission.

Referring now to Figures 1 and 2 disclosing one embodiment of the six speeds forward and two speeds reverse transmission operating mechanism constituting my invention, there is provided a manually operated selector mechanism positioned adjacent the drivers seat I2. This mechanism, as with the corresponding selector mechanism disclosed in Figures 3 and 4, includes two levers and the parts of said mechanism are so constructed and arranged that it is possible to move one or the other of said levers to establish one or the other of the transmission units 54 and 56 in gear when and only when the remaining lever is positioned to neutralize the other of said transmission units.

In the transmission operating mechanism of Figures land 2 the selector lever mechanism includes two levers Ill} and 2 approximately one half of each lever being housed within a box HQ. The lever Ht which is preferably longer than lever H2, is movablethrough slots in the detachable top plate N5 of the box H4, the extremities of said slots being indicated by the reference numerals i-t inclusive. The lever III) outlines the letter H in successively moving to the positions I to s inclusive, outlines another letter I! in successively moving to the positions 3 to 6 inclusive and outlines yet another letter H in successively moving to the positions I, 2, 5 and 6. These gear shifting movements of the lever IIiI are efieoted in. cooperation with an operation of the lever i i2,.all as is described hereinafter. As disclosed in Figure 2 the lever I I2 extends through a slot in the top plate I i5 and, as described above, may be moved from its transmission neutral position, that is the position of the lever disclosed in Figure 2, to either its low gear position, indicated by the word Low, or to its reverse gear position,

, indicated by Rev, when and only when the lever H5 is positioned somewhere in the slot I, 2 that is when the transmission unit 5 3 is neutralized.

Continuing the description of the transmission operating mechanism disclosed in Figures 1 and 2, the selector levers Iii? and H2 are connected by three separate force transmitting means with the aforementioned cranks 6B, 94 and IDA. Describing these three force transmitting means and associated parts including interlock means, there are provided two support members H6 and H8, igure 2, secured to some part of the chassisof the tank or a part fixedly secured thereto. The support member Ht is provided with two cylindrical openings, one of said openings receiving therethrough a rod I2 having bifurcated ends. The lever I 82 is straddled by the furcations of one end of the rod E26 and a pin I22 extending through said furcations and lever serves as a means for pivotally connecting said lever and rod. The lever i I2 is pivotally mounted, that is fulcrumed, upon a pin i2t extending through said lever intermediate its ends and through the furcations of the bifurcated end of a curved support arm I26 I secured to and extending from the support member i ES. The lever H9 is pivotally mounted, intermediate its ends, upon a pin I28 extending through said lever and the furcations of the bifurcated end of a curved arm I39. The latter arm is preferably cylindrically shaped at its lower end I32, Figure 6, said end being sleeved over and keyed by a pin IS-i, to a tubular member I36 which extends through one of the openings in support member 5 It. Through the lower end of the lever Hi! there extends a pin I31, the ends of said pin extending through furcations of the bifurcated end of a rod I38; and said rod extends through the tubular member E36.

Completing the description of the force transmitting means interconnecting the lever l l2 with the crank I28, the furcaticns at one end of the rod l28 receive-apin i'de whichextendsthrough the end of one armofa bell cranklever I42 which is pivotally mounted on a portion of the support member II8, all as' disclosedin'Figure 2. A rod I44, bifurcated-at both of its ends, is pivotally connected at one-of said ends, to-an arm of the bell crank lever I22 and is pivotally connected at its other end 'to'the aforementioned crank I08. The transmission unit 58 is therefore connected with the-selector lever II2 by force transmitting means including rod I20,bell crank lever I42, rod M5; orank- I58, shaft I88 and crank I04.

Completing the description of the force transmittingmeans for operating the nest of gears or transmission unit-5e, the tubular member I36 is enlargedat one of its ends to provide a hub portion M5 from which extends a crank I 38. The upper end of the arm IE8 is pivotally connected to a-link I-52, Figure 9, said link being welded at I54 to a relatively short nipple I56. As disclosed in Figure l a flexible conduit I58 is connected to interconnected pipes I58 and I82, the latter being connected to the intake manifold of the internal combustion engine 26. The nipple I58 is connected at IE4 to a hollow rod and the other end of said rod is tightly fitted-within a recess in the end-of a spool-shaped valve member I68. Reaction lever members no and I12, Figure 2, are pivotally connected intermediate their ends, to a pin I'i i mounted in the furcations of the bifurcated end'ofa link H5 pivotally connected at its other end'to the aforementioned crank 88. The pin I14 extends through an opening in the crank I48 to make-possible a relative movement of said crank and the lever members He and I12, .all as described hereinafter. The construction and arrangement of the lever members I18 and I12 and crank I48 duplicate the corresponding elements of the mechanism disclosed in Figure 8. This figure or" the drawing discloses a part of the force transmitting means interconnecting the lever I II] andtransmission unit 52. The lever members I18 and IE2 are pivotally connected by a pin I78 to the crank I 83 and the upper ends of said members are pivotally connected by a pin I88 to the yokeshapedend' E82 of a hollow connecting rod I84. The: arms of the yoke I32 straddle the link I52 andnipple I55, all as disclosed in- Figures'9, and 11. The pin I88 extends through an opening in the end of the crank I48, thereby making possible a relative movement of the crank I48 and lever-members I18 and I12.

The power element; that is piston I86, of a pressure differential operated motor I88 is fixedly secured to ahereinafter described valve member I39 constituting the end portion of the connecting rod'IBfi, said piston'being reciprocable within the cylinder I of saidmotor. As disclosed in Figure 2'the motor I88 is pivotallymounted by a ball and socket connection I92, to an arm portion of the support H8. The aforementioned end portion I89 of the hollow rod I84 is ported at I94, I98, I58 and 258, said portion thereby constituting one of the two parts of the control valve of the motor I88, .the remaining part being the aforementioned spool-shaped member I68. This valve member I58is bored, as dislosed in Figures 9, 10 and 11, toprovide ducts 252 and 2M.

Describing now the third of the transmission operating forcetransmitting means, namely that force transmitting means for operating the transmission .unit 52, the lever IIfl, as previously described, ispivotally connected at its lower end to the rod I38 which is slidably mounted within the aforementioned tubular member I36. As disclosed-in Figures-'2' and 8 the rod-I 3Bisbifurcated' at-its other endand-a pin 286 extends through the furcations of said end portion, through the lower end of reaction-lever members 2'il8 and" 2H) and through a crank 2 I2 pivotallymountedupon a pin 2 I4 tightlyfittedwithin a'recess'in a portion of the support member I I8. The furcations of the bifurcated end-0f a rod 216 are pivotally connected by a pin 2I8 to the lever members 288 andZIIl, said pin-as disclosed in Figure- Lextending through an opening in the crank 2I2. The rod 2I6 is pivotally connectedat 220 to the aforementioned crank -66 extending from the lower end ofthe shaft 64.

The remainder of the force transmitting means for operating'the transmission operatingunit" 52 consists of a pressure differential operated motor 222 and theconnections between the powerelement of said motor and the above described-reaction levers 208 and 2 III. The construction and arrangement of the parts of said connections, the motor 222, thecontro1 valve housed therein and the connection between the valve and crank 2'i2 duplicate the "same parts disclosed in'Fig- 'ures 9, 10 and 11 and which parts have been'described above.

Referring now to Figure 6, there is disclosed therein one of the important features of the-invention disclosed in Figure 2, that is theinterlock means cooperating with the slotted cover plate H5 of the box H4 to make possible a'gear selecting operation of the transmission unit 56 when and only when the transmissionunit54 is neutralized; also to make possible a gear selecting operation of the transmission unit when and only when the transmission 56"is neutralized. This interlock means consists of a pin 224'housed within a slot in the support member II6,said slot extending parallel or substantially parallel to the base of "said member. The ends of the pin 228 are rounded, one end being adapted to fit within an opening 225 in the tubularmember I36 andthe'other endwithin'a'recess 228 in the rod I20. The operation of this interlock mechanism is described hereinafter.

Describing'now the operation of the above described transmission operating mechanism, that is the mechanism disclosed inFigures'1,'2,'6,"8, 9, 10, 11 and 12, when the driver wishes to start the tank in motion in first gear or what may also be termed low, low gear, he will probably first disengage the friction clutch by depressing the clutch pedal I5 regardless of whether or not the transmission .unit 52 is inneutral. Then after the engine is cranked, thereby idling th same to create a source of vacuum in theintakemanifold, the driver will, if the three transmission units 52, 54 and are not already neutralized, move the selectorlevers H8 and H2 to the positions disclosed in Figure 2, that is theirposition to neutralize said transmission units. The lever H2 is then positioned in the center of the low reverse slot in the plate H5 and the lever H8 is positioned in the center of the slot which may be defined as slot I,'2 and'is also positioned in the center of the cross-over slot indicated by the letters C andO'and extending across the plate H5. Now'when the selector lever H0 is in its transmission neutral position as disclosed'in-Figure 2, the pin 224'registers with the opening 225 in the tubular member I36 therebymaking it possible to move the lever II2 to either it low gear or reverse gear position indicated by the aforementioned indicia Low and Rev inFigure 2; for upon examiningFigure 6 it will'be direction the pin 224 will be moved bodily, one end of the same moving into the opening 226 and the other end being forced out of the recess 228.

At this juncture it is also to be noted that by virtue of the above described interlock mechanism it is not possible to move the selector lever H6 laterally to operate the transmission 54 if the selector lever H2 is in either its low gear or reverse gear position; for when the transmission unit 56 is established in either low gear or reverse gear the end of the pin 224 is positioned in the opening 226 thereby preventing a rotation of the lever III). In other, words, as stated above, it is impossible by virtue of the interlock mechanism of the invention, to establish the transmission unit 54 in gear when the transmission unit 56 is in gear and vice versa it is impossible to establish the transmission 56 in gear when the transmission unit 54 is in gear.

Continuing the description of the operation of the mechanism to establish the transmission mechanism in low, low gear, the driver will move the shift lever II2 to the position marked Low thereby manually operating the crank I68 to establish the transmission unit 56 in its low gear setting. The driver will then move the selector lever III? to its low gear position, that is the position indicated by the reference numeral I, thereby establishing the transmission unit 52 in its low gear setting and establishing the entire transmission mechanism in its low, low or first gear setting, 7

Describin now the operation of the pressure differential operated motor 222 which description also applies to the motor I38, the two motors being of identical construction; and also describing the operation of the force transmitting means interconnecting the selector lever I III with the crank 68, when said lever is moved from its transmission neutral position toward its low gear position, the rod I33 is tensioned to move the same to the left, Figure 2, thereby rotating the crank 2I2 counterclockwise and rotating the reaction' levers 268 and 2IEI clockwise about the pin 25 8. The pin H8 is held stationary at this time inasmuch as the force necessary to move the rod 2 I6 and the sliding gear 58 connected thereto is greater than the force required to move the pieton of the motor 222 to the right, Figure-2. At this juncture it is to be remembered that as to the motor 222, the piston, valve and other parts therein are duplicates of the corresponding parts of the motor I88 disclosed in Figures 9, 1 and 11. In the following description of the operation of the motor 222 reference Will be made therefor to the parts of the motor I88. Now the aforementioned rotation of crank 2 I2 and the reaction levers 268 and are results in a relatively quick valve opening movement of the valve members I63 and I89; for the piston I86 and the valve member I89 connected therewith are moved to the right, Figure 2, and the valve member M58 is moved to the left. Referring now to Figures 9 and 11, the piston I86 and the valve member I89 will, with this operation, be moved tothe left from. the transmission neutral position of. said members disclosed in Figure 9; and the valve member I68 will be moved to the right. The valve members then assume the relative positions disclosed in Figure 11; however, said members will be located near the center of the cylinder We. A compartment 236 of the pressure differential operated motor is by this valve opening or valve cracking operation connected to the intake manifold of the engine 26 via a conduit 232,

nipple I56, hollow rod I66, duct 264 in the valve.

member I68 and the ports I96 and 296 in the valve member I89. A compartment 234 of the motor is, by this operation of the valve mechanism, connected to the atmosphere via a nipple 236 mounted in an end plate 238 of the cylinder I90, ports 246 and 242 in the hollow connecting rod Iii I, the duct 262 in the valve member I68, a compartment 244 outlined by the end of the rod I84 and the end of the valve member I68, and ports led and its in the valve member I89. The compartment 235 is then partially evacuated and this results in the piston I86 being subjected to a differential of pressures with a consequent 'movernent to the left, Figure 2, to establish the transmission unit 52 in its low gear setting; and it is to be noted that the piston I66 and the valve member 589 connected thereto are moved to the right in Figure 2 when the valve is opened and that these parts then reverse their direction of movement when the motor is energized, all as just described.

Now when the sliding gear 58 of the transmission unit 52 contacts the gear or other member to be meshed therewith, said gear 58 will be momentarily stopped, whereupon the force exerted by the piston I86 to mesh said gears will be increased by virtue of the fact that the efflux of air from the compartment 236 is continued so long as said compartment remains connected to the intake manifold. The period of interruption of movement of the gear 58 will of course be of very short duration inasmuch as said gear, which is covered with lubricant, will quickly slip into mesh with the gear to be interlocked therewith. Now it is to be noted that as a result of this interruption and the above referred to continued evacuation of air from the compartment 230, the resistance to movement of the selector lever IIB will be increased in direct proportion to the increase in differential of pressures acting on the piston I86; and this reaction or resistance to movement of the selector lever H6 is known in the art as feel. Explaining the operation of the mechanism to effect this so-called feeL-it is to be noted that the reaction levers 26B and 258 are, with the above described operation of the force transmitting linkage, acting as levers of the first class, the fulcrum of said levers being located at the pin H8 and the two loads upon the levers being exerted at their ends. It follows therefore that as the load exerted by the piston I 86 increases, said load being applied at the pin 2I3, the load exerted by the physical effort of the driver increases, said load being applied at the pin 206. It follows therefore that throughout the entire operation of moving the gear 58 from its transmission neutral position to its meshed position the driver will do a part of the work to effect this meshing of the gears, the amount of said Work and the amount of force exerted by the driver being directly proportional to that effected by the pressure differential operated motor.

It is also to be noted that the above described transmission operating mechanism provides what is known in the art as a follow-up control of the motor; for if perchance the driver should stop the movement of the selector lever it before the gear 58 abuts the gear or other memher with which it is meshed then the movement of the pin 266 will be stopped. The movement of the pin 2IS will, however, be continued until the valve mechanism is lapped to place the sys- 11' tem in equilibrium. 7 Describing this..lapping.-.operationof the valve mechanismand referring ,to Figuregll', .whencthe valve part. 892 is movedrto the right. suflicientlyto bring the ports I96" and 20.9 iovena land portion 24$of. the valve member I68,;"th'en the compartment 230 will be. cut off from the intake .manifoldandtheparts of the mechanism will. remainin their then existing relative positions, that is .the lapped positionof thevalve mechanism, untilthe selector lever. I I is again moved to crackthe valve mechanism.

It is also to be noted that if for anyreason the motor1.222'should fail to function the transmission unit 521 would then .be. operated solely bytthe physical efiort of the driver; for after the clearance between the pin 2I8 and the. surroundingopening in the. crank 2I2 is taken up, then'therod 2I6 would be moved solely. by said physical effort.

At this'juncturezit may also be observed that ifth'e transmission units 52 and 5d are each equipped with .a synchronizingv mechanism to provide. what is known in the art as a synchromesh transmission, then the above. described follow-up and feel operations of. the transmissionoperating mechanism of my invention will be particularly eifectiveto control the operation of said transmission units; for when'the'clutches or blockersof said synchro-meshmechanism are operating to synchronize the1speeds1of the gears to'ibe meshedthe driver will, by virtue. of the above described resistance .to movement of the selector lever *I II), be conscious of the operation of the synchronizing mechanism and will probably; refrain: from. unnecessarily forcing the selector leveritoward its gear :established position.

Briefly reviewingthe description of the opera: tion of the-piston and valve :parts, whenthe transmission unit 52' is'in its neutral position, said'piston and valveparts' are in the position disclosed in' Figure 9 andwhen said transmission unit is established in' its low gear setting the pistonand valve parts areiin the'positions disclosed in Figure 11.

Continuing'now the description of the operation of the power plant as a whole, the transmission'mechanism having been established in its low; low setting by the above "described .operationof placing the transmissionunits52 'and 56"in'their low gear settings, the driver then re-engages the friction-clutch by releasing the clutch pedal I6 and at the same time depresses the accelerator 28 to open the throttle 1 and speed up the engine. When the tank has reached the desired speed in thelowylowsetting of thetransmission, the driver will then probably operate the transmission to establish the same in'its' high,'low, that is second gear, setting." This is effected by first'disengaging the friction clutch to uncouple the engine from the-transmission mechanism and then-moving the selectorlever' I I6 from its low gear position to its high gear position indicated by the reference'numeral 2, Figure 2. With this operation, the rod" I38 is placed in compression. thereby efiecting a counterclockwise rotation of the valve operating reaction levers 2H8 andg2I!) and a clockwise rotation of the valve operating crank 2I2. The motor- 222 is thus again energized and this operation of the motor serves, together with the physical effort of the driver, to establish the transmission unit 52in its high gear position. As to this operation of the motor 222 and the other parts of the force'transmitting-means for operating. the transmissionnnit 52, the;cycle.of-.operations of :thevalve operating and,forcetransmitting linkagewill notbe given in detail inasmuch as. said operations are merely the reverse of the heretofore described operations :for.. effecting. the -,lowgear setting of said transmission. unit.- It will suifice to say. that the'valve members I68 andl89 are first moved from the-relative positions disclosed in- Figure 11 tothezrelative positions disclosed in Figure 10,.not the actual positions of these parts. as disclosed in- Figure 10, whereupon thecompartments 234 and'230. are. connectedto the',.intake manifold and the atmosphere respectively. The piston 186- then moves, to .the left to:the.position disclosed-inFigure 10 thereby.. moving-.ti1e gear member -58- to.-its..meshed position. to establish thectransmission ,unit 52 in its high-gear position. The transmissionmechanism as a whole is theneestablished .inits secondgear setting. As

to the above described follow-up operation of the-'valvemembers and the. feelor-resistance to movementof .the selector lever, these functions of-themechanism-arethe sameas those previously d-escribedineffecting the low,.low-or.first gear; setting. of the transmission mechanism.

Theatransmission mechanism having beenestablished intitssecond 'gear. setting; the driver willthen re-engage the friction clutchanddepressthe accelerator: to increase the speed of the tank;

The desired speedzof the tank having been attained-the driver may thendesiretoestablish the transmission mechanism in its third speedzsetting.-. As-before, the. accelerator is first;released and the friction clutch disengaged whereupon the :driver neutralizes the" transmission: units 52 and 55 by returning-the selector levers II'0=and I I2:to' their transmission neutralpositions shown in Figure 2; and'then "the-driver rotates the selectorlever -II0' to. the right, Figure 2, into the center: of theslot 3, 4, thatv is the positionindi'c'atedby the letter O. This operation serves to rotate the tubular member I36 clockwise thereby rotating the crank I48 clockwise and the reaction levers I10 and I12 counterclockwise. This operation is possible inasmuch as the pin I14 is, forthe reason described above, at the time stationary thereby acting as a fulcrum for the levers I10 and I12 and the crank I48 is provided with a relatively large opening, not shown, through which said pin extends. The valve members I68 and I89 of the motor- I88 are therefore'movedin opposite directions to crank the valve and the valve member I89 at the hub of the piston, then reverse its direction of movement, all as previously described. As previously described'the motor 188 is thus energized, the crank I48 being moved counterclockwise thereby moving'the gear 82 into mesh with the gear I8 to establish'the transmission unit 54 in its low gear setting.

To. complete the third speed setting of the transmission mechanism the driver then moves the selectorlever H0 in the slot 3, 4 to the end of 'saidslot indicated by the reference numeral 3, Figure-2; and this" operation serves to repeat the-above described low gear operation of the force transmitting means for operating the transmissionunit 52'. In other words, the transmission unit-'52 isagain established in its low gear setting after'the transmission unit '54 is 'established in its 'low gear setting. The driver then re-engagesthe friction clutch and speedsup 13 the tank to attain the desired speed in the third speed setting of the transmission.

To establish the transmission in its fourth gear ratio setting the driver, after again releasing the accelerator and disengaging the friction clutch to reverse the torque, moves the selector lever I It to its fourth speed position indicated by the reference numeral 4 in Figure 2; and this operation serves to repeat the above described operation of establishing the transmission unit 52 in its high gear setting. The driver then reengages the friction clutch and depresses the accelerator to attain the desired speed of the tank.

To establish the transmission mechanism in its fifth gear ratio setting the driver, after releasing the accelerator, will in succession disengage the friction clutch, neutralize the transmission unit 52 by returning the selector lever III] to its transmission neutral position 0, then move said lever laterally through the cross-over slot C, into the position C in the slot 5, 6 and lastly will move the lever III) to the position indicated by the reference numeral 5. This cross-over operation of the selector lever I'I0 serves to effect an operation of the motor I88 to establish the transmission unit 54 in its high gear setting, the operation of the reaction levers I10 and I72 and crank I48 being just the reverse of the above described operation of said parts in establishing said transmission unit in its low gear position; and by moving the lever Ill] from the position C to the position in the slot 5, 5 the motor 222 is again energized to again establish the transmission unit 52 in its low gear setting.

To complete the forward speed cycle of shifting operations of the six speeds forward and two speeds reverse transmission mechanism IE1, the driver, after the tank has attained the desired speed in the fifth speed setting of said transmission mechanism, moves the selector lever I II) to the position indicated by the reference numeral 6 in Figure 2; and this operation serves to again establish the transmission unit 52 in its high gear setting and complete the operation of establishing the transmission mechanism Ill in its sixth speed setting.

To effect the two reverse speed settings of the transmission mechanism III the driver first brings the tank to a stop with the engine idling whereupon he neutralizes the transmission units 52 and 54 by moving the selector lever II!) to the positions disclosed in Figure 2. He then, in succession, moves the selector lever I III to its reverse speed position and the selector lever II2 to either its first or second speed positions depending of course upon the gear ratio desired. There are disclosed in Figures 3 and 4 other embodiments of the transmission operating mechanism constituting my invention. Referring to Figure 3, this embodiment of my inven tion duplicates the previously described embodiment disclosed in Figure 2 with the exception of the force transmitting means for operating the transmission unit 56; and there is also a simplification of the support member adjacent the box housing the selector levers. Those parts of the mechanism of Figure 3 which are duplicates of the corresponding parts in the mechanism of Figure 2 are indicated by the reference numerals of the latter parts plus a prime.

Describing the mechanism disclosed in Figure 3 which diifers from the mechanism of Figure 2, the mechanism of Figure 3 includes a box 255 which'may be detachably secured to the floor of the tank adjacent the drivers seat. This box,

the sides and slotted top of which are preferably detachably secured together, serves to house selector levers Ill! and 252 and a support member 254 which is preferably detachably secured in position. The two force transmitting means interconnecting the lever I I6 with the transmission units 52 and 54, Figure 12, will not be described in detail inasmuch as said means duplicate the force transmitting means of the mechanism disclosed in Figure 2.

Describing in detail the force transmitting means for operating the transmission unit 55 the selector lever 252 extends through a slot in the top plate of the box 250 and is enlarged at its lower end to provide a hub portion 255, Figure 7, which is sleeved over and secured by a key 255 to a tubular shaft 253. As disclosed in Figure 7, the shaft 253 telescopingly receives a tubular member I36 and a rod I38, the latter being fitted within the member I36. The other end of the shaft 2521 is enlarged to provide a hub mem her 260 to which is secured a crank 262; and the force transmitting means interconnecting the crank 23?. with the sliding gear 96 of the transmission unit 55 includes a rod I44, pivotally connected at one of its ends to said crank 262 and at its other end to a crank I08. The crank I03 is connected to a shaft I journalled in bearings in the casing of the transmission I0; and a crank I04 forked at its end to embrace the ear 96 and connected to the shaft I 85 completes the connection.

There is also provided means, in the mechanism disclosed in Figure 3 and corresponding to the mechanism disclosed in Figure 6, for preventing a meshing of gears of either the transmission unit 54 or the unit 55 when the other of said transmission units is established in gear. As disclosed in Figure '7 this interlock means consists of a pin 264 extending through an opening in the support member 254, said pin having rounded ends, one end 2636 adapted to fit within a recess in the hub 255 when and only when the lever 252 is in its transmission neutral position and the other end 263 of said pin adapted to fit within a recess in a hub member 276 of a curved arm Ht when and only when the lever I Ill is in position to neutralize the transmission unit 54. With this construction it is apparent that the selector lever lIIl' may be rotated to establish the transmission unit 54 in gear when and only when the selector lever 252 is in its transmission neutral position as disclosed in Figure 3; and the selector lever 252 may be rotated to establish the transmission unit 52 in gear when and only when the selector lever Hil is located somewhere in the slot I, 2, preferably the center thereof.

The operation of the transmission operating mechanism of Figure 2 having been described in detail, it Will not be necessary to describe at great length the operation of the mechanism disclosed in Figure 3. Suffice it to say that having moved the selector lever Mi into the slot I, 2 to thereby neutralize the transmission unit 54, the selector lever 252 may then be moved to either its reverse or low gear position. Should any one of the third, fourth, fifth or sixth forward speed settings of the transmission mechanism be desired the driver, after reversing the driving torque by releasing the accelerator and disengaging the friction clutch, will first neutralize the transmission unit 56 by moving the selector lever 252 to its transmission neutral position N and he will then operate the transmission units 52 and 54 by movingthe. lever iiilfito theposition to effect these operations, that-is to any one of the positions numbered 3, 4, or 6 in the top plate of the box 250.-

Referring now to Figure 4 disclosing the preferred embodiment of invention, as with the embodiment of my invention disclosed in Figures 2 and 3, there is provided three independentl operable force transmitting means interconnecting the manually operable selector mechanism with the three transmission units 52, 5 3 and 55 of Figure 12.

Describing the'forcetransmitting means for operating the transmission unit 52 a selector lever 210, tubular throughout a major portion of its length, is housed within a box 2T2 mounted adjacent the drivers seat. The lower end of said lever is provided with furcations 2H; and 2'56 which straddle flanges 278 and rectangular in cross section. These flanges extend crosswise of the box 212 and are preferably integral with the base portion thereof. A rod 282 slidably mounted within a tubular shaft 2% is pivotally connected at one of its ends 288 to the lever Eli and is pivotally connected at its other end 288 to reaction levers 296 and 292'and a crank 2%. As with the above described embodiments of my invention the crank 2&4 and reaction levers 2% and 292 are connected to the relatively movable parts of a control valve of a pressure differential operated motor, said motor, indicated by the reference numeral 296, being a duplicate of the motor disclosed in Figures 9, l0 and 11. The motor is pivotally supported at to an arm of a support member 3538. As with the mechanism disclosed in Figures 2 and 3 the reaction levers 2% and 292 are pivotally connected to force transmitting means interconnecting said levers with the sliding gear 58 of the transmission unit 52. This force transmitting means differs, however, from the corresponding force transmitting means of the mechanism disclosed in Figures 2 and 3 and includes a crank 302 extending from and preferably integrally secured to a shaft 3% rotatably mounted upon a pin 366 fixedly secured to the support member 339. The hub portion of the crank 29% is of course also rotatably mounted on the pin 366. From the end of the crank 352 there extends a pin 308 which pin extends through the reaction levers 296 and 292 intermediate their ends. The pin also extends through a relatively large opening in the crank 29% to make possible the above described movement of the parts of the control valve in opposite directions to open the valve.

Completing the description of the force transmitting means for operating the transmission unit 52 to one end of the shaft 384 there is secured a crank 3H} which is pivotally connected at its end to one end of a rod 3l2. The other end of the rod 312 is pivotally connected to a crank 3M extending from one end of a shaft 3E6 journalled in bearings mounted in the transmission casing l9; and to the upper end of the shaft Bid there is connected a crank 3E8 forked at its end to embrace the sliding gear 58 of the transmission unit 52.

Now inasmuch as the motor 296, its control valve and the reactionary links and crank for operating said valve duplicate the corresponding mechanism disclosed in Figures 2, 3, 9, 10 and 11 which have been described above, it follows that it is unnecessary to repeat the description of the operation of said mechanism.

Describing now the force transmitting means for'operating the transmission unit 5d, said means includes a crank 32c keyed to one end of the aforementioned tubular shaft 28 said shaft being rotatably mounted within a tubular shaft 322 and journalled in a bearing 32 constituting a part of the support member 389. The other end of the tubular shaft 284 is enlarged at 326 to provide the hub portion of a crank 328 and said crank is pivotally connected at 330 to reaction levers 332 and 334. Duplicating the mechanism disclosed in Figures 2 and 3 the remainder of the force transmitting means for operating the transmission unit 54 includes a pressure differential operated motor 338, a link 33S pivotally connected to the levers 332 and 334 and to a crank 360. The latter crank is secured to one end of a shaft 342 which is journalled in bearings mounted in the transmission casing l8; and a crank 344, forked at its end to embrace the sliding gear 58, is connected to the other end of the shaft 342.

The force transmitting means for operating the transmission unit 56 includes a crank 348 extending from a tubular member 348 preferably keyed to one end of the aforementioned tubular shaft 322. The other end of the shaft 322 abuts the bearing 324 of the support member 365! and this end of said shaft is preferably enlarged to provide the hub portion of a crank 35th The latter crank is pivotally connected to one end of a link 354 and said link at its other end is pivotally connected to a crank 356. The crank 356 is connected to a shaft 358 which is journalled in bearings mounted in the transmission casing H3 and to the upper end of said shaft there is secured a crank 36% forked at its end to embrace the sliding gear 96 of the transmission unit 56.

Describing now the operation of the preferred embodiment of my invention disclosed in Figure 4 and incidentally completing the description of the manually operated selective lever mechanism for operating the above described force transmitting means, if the driver wishes to establish the transmission mechanism in its low gear setting he first moves a two-part lever 352 into position to operate the crank 34B. Describing the means for effecting this operation the lever 3552 consists of plates 35% and 36B pivotally connected to the lever 21:! by a pin 368 and pivotally connected by a pin 370 to a rod 312 which extends through the tubular portion of the lever 210 as disclosed in Figure 5. The plate 3'64 of the two-part lever 362 is provided with a downwardly extending finger 314. To the upper end of the rod 312 there is connected a pin 376 which extends through a slot 318 in the lever 210. To the pin 316 there is secured a relatively short tubular member 380 provided with a flange 382.'

Now when the driver wishes to establish the transmission mechanism in its low, low, that is first gear ratio setting he places the palm of his hand upon a ball 284 secured to the end of the lever 210 and then, with his fingers, lifts the member 388 upwardly, against the tension of a spring 386, to the position disclosed in Figures 4 and 5. As will beapparent from the disclosure of the mechanism'shown in Figure 4, this operation will effect a clockwise rotation of the two-part lever 362 moving one end of the same opposite the end of the crank 3&6. It is to be particularly noted that this operation is only possible when the lever 210 is in the position disclosed in Figure 4 and indicated by the letter N; for when the lever 270 is in this position the furcations 214 and 216 of said lever are positioned immediately is rotated to select the crank 346.

adiacent the space between the flanges 2'18 and 280 thereby making possible a movement of the finger 314 through said space when the lever 362 It is also to be noted that when the lever 210 is in the position disclosed in Figure 4, the transmission units 52 and 54 are neutralized and the transmission unit 52 may not be operated to establish the same in gear; for when the lever 210 is in this position it abuts portions of the cover plate of the box 212 and may not be moved to any one of the four gear establishing positions in the ends of the slots in said plate.

Continuing the description of the operation of the mechanism disclosed in Figure 4, to efiect the low gear setting of the transmission unit 56, having actuated the lever 352 to make possible an operation of the crank 345, the lever 2'10 is then rotated counterclockwise about its pivotal connection with the rod 282, the upper end of said lever moving into the slot 3, 4. This operation serves to rotate the crank 346 counterclockwise, thereby rotating the crank 358 and, through the intermediary of the above described connections, establish the transmission unit 55 in its low gear setting. The driver then moves the lever 210 in the slot 3, 4 to its low, low position, said position being so indicated in Figure 4 of the drawings, thereby establishing the transmission unit 52 in its low gear position and completing the operation of establishing the entire transmission mechanism in its first gear ratio setting. The friction clutch is then re-engaged and the accelerator depressed to attain the desired speed of the tank in said first gear setting.

Should the driver then desire to establish the transmission mechanism in its high, low, that is second gear setting, he merely has to move the lever 210 into its high, low position, Figure 4, it being understood of course that this operation is facilitated by first disengaging the friction clutch.

To establish the transmission in either of its low reverse or high reverse settings, the driver will, after actuating the lever 362 so that the two parts thereof straddle the end of the crank 346, move the lever 210 from its neutral position N into the channe1 5, 6 thereby manually operating the transmission unit 56 to establish its reverse gear setting. The lever 210 is then moved to either the low reverse or high reverse position depending upon the transmission setting desired, this operation serving to operate the transmission unit 52. It is to be noted that in effecting the operation of the transmission unit 52 the lever 210 fulcrums at its lower end, the furcations 214 and 216 pivoting upon one or the other of flanges 218 and 280.

To operate the transmission mechanism to establish the same in any one of its third, fourth, fifth, or sixth speed settings, the driver first moves the lever 210 laterally to establish the transmission unit 54 in the desired setting and then moves said lever either forwardly or backwardly to establish the transmission unit 52 in the desired setting. It is to be noted that to effect these four settings of the transmission mechanism the member 380 is not lifted upwardly to actuate the lever 352; for the spring 386 interposed between the ball 384 and the flange 382 serves to bias the lever member 362 into position to operate the crank 32 B, said crank constituting a part of the force transmitting means for operating the transmission unit 54.

Reviewing the features of the transmission 18 operating mechanism disclosed in Figure 4, it is to be noted that, as with the mechanisms disclosed in Figures 2 and 3, there are provided three separate force transmitting means for operating three separate transmission operating cranks extending from the transmission casing and there is also provided a manually operable selector lever and interlock mechanism for operating said force transmitting means. In the mechanism if Figure 4, the lever 3(52, finger 374, space between the flanges 218 and 285 and the cranks 32!] and 356 cooperate with each other and with the remainder of the mechanism to insure a neutralization of the transmission units 52 and 5t before the mechanism may be operated, that is rotate the lever 352, to make possible a gear shifting operation of the transmission unit 55; and this mechanism makes possible a gear shifting operation of the transmission unit 54 when and only when the parts are operated to first neutralize the transmission units 56 and 52.

There is thus provided, as exemplified in the above described three embodiments of my invention, a simple and compact mechanism for operating a six speeds forward and two speeds reverse transmission mechanism of a motor vehicle, said transmission mechanism including three separate transmission units; and the motor vehicle having said transmission mechanism incorporated therein may be either a tank or an automotive vehicle.

In all three of these embodiments the transmission operating mechanism constituting my invention includes three separate transmission operating force transmitting means, two of which preferably include power means; and these three force transmitting means are actuated by a manually operated selector lever mechanism, including two lever members and interlock mechanism, the parts of which are so constructed and arranged and so operative that one or the other of two of the transmission units of the transmission mechanism is neutralized before the remaining transmission unit of said two units may be operated to establish the same in gear.

Although this invention has been described in connection with certain specific embodiments, the principles involved are susceptible of numerous other applications that will readily occur to persons skilled in the art. The invention is, therefore, to be limited only as indicated by the scope of the appended claims.

I claim:

1. In a motor vehicle having a change-speed transmission mechanism. consisting of two change-speed units connected in series and which mechanism may be established in any one of a plurality of gear settings, means for operating said transmission mechanism comprising lever mechanism including two manually controlled levers and means, including a plurality of shafts and a plurality of pressure difierential operated motors, interconnecting said lever mechanism and transmission mechanism, the parts of said lever mechanism being so constructed, so arranged and so operative that one of said levers is operative, during a certain operation of said lever mechanism, to effect either one of two relatively low gear ratio settings of the transmission mechanism or either one 01 two reverse gear settings of the transmission mechanism when and only when the other of said levers is placed in a certain position.

2. In a motor vehicle having a change-speed transmission mechanism consisting of two change-speed units connected in series and which mechanism may be established in any one of a plurality of gear settings, means for operat ing said transmission mechanism comprising three force transmitting means connected with said transmission mechanism, manually operated' lever mechanism and means, including an interlocking member movable Within a slotted portion of a part of the transmission operating mechanism, interconnecting said lever mechanism and force transmitting means the parts of said lever mechanism and interconnecting force transmitting means being so constructed and arranged that a part ofsaid lever mechanism may be operated to effect either one of two relatively gear settings of said mechanism when and only when another part of said lever mechanism is placed in a certain position.

3. In a motor vehicle having a change-speed transmission mechanism consisting of two change-speed units connected in series and which mechanism may be established in any one of six forward speed settings or two reverse speed settings, means for operating said transmission mechanism comprising manually operated lever mechanism including a lever member having an H-movement and another lever member pivotally mounted thereon and means, including a plurality of shafts and a plurality of pressure differential operated motors, interconnecting said lever mechanism and transmission mechanism the parts of said lever mechanism being so constructed and arranged that a part of said mechanism may be operated to effect either one of two relatively low gear settings of the transmission or either one of two reverse gear settings of the transmission provided another part of said lever mechanism is placed in a certain position.

4. In a motor vehicle having a six speeds forward and two speeds reverse transmission mechanism consisting of two change-speedunits connected in series, means for operating said transmission mechanism comprising two' interconnecting levers each of which is manually operated and means, including a plurality of shafts, interconnecting said levers and transmission mechanism the parts of said lever mechanism being so constructed and the parts thereof so arranged that a part of said mechanism housed within another part of said mechanism may be operated to effect either one or the other of two relatively low gear ratio settings of the transmission mechanism or either one or the other of two reverse gear settings of the transmission mechanism provided the first mentioned part of the lever mechanism is in a certain position.

5. In a motor vehicle provided with a change speed transmission mechanism capable of being established in any one of six different forward speed settings or either one of two reverse speed settings said transmission mechanism consisting of two separate change-speed units connected in series, means for operating said transmission mechanism comprising three separate force transmitting means each of said means being connected to a different portion of the transmission mechanism and further comprising a manually operated lever mechanism connected with said force transmitting means said lever mechanism comprising a lever member having an H -movement and another lever member pivotally :low forward gear settings of the transmission mechanism or efiect either one of two reverse 20 mountedthereon andoperated by means extending through the lever member having the H- movement.

6. In a motor vehicle provided with a changespeed transmission mechanism capable of being established in any one of six forward speed settings or either one of two reverse speed settings said mechanism including three separate nests of gears, means for operating said transmission mechanism comprising three separate force transmitting .means each of said means being connected to one of the aforementioned nests of gears and further comprising a manually operated lever mechanism operably connected to said force transmitting means said lever mechanism comprising a lever member having an H- movement and another lever member pivotally mounted thereon and operated by means extending through said lever member having an H- movement.

7. In a motor vehicle provided with a changespeedtransmission mechanism capable of being established in any one of six forward speed settings or either one of two reverse speed settings said mechanism including three separate nests of gears, means for operating said transmission mechanism comprising three separate force transmitting means each of said means being connected to one of the aforementioned nests of gears and further comprising a manually operated lever-mechanism comprising a lever member having an H-movement and a lever member pivotally mounted thereon and operated by means extending through the lever member having the H-movement said force transmitting means including a shaft constituting. a part of the means for operating one of the nests of gears, a tubesleeved over said shaft said tube constituting a part of the means for operating another ofthe aforementioned nests of gears and another tube sleeved over the aforementioned tube and constituting a part of means for operating thethird of. the aforementioned nests of ears.

HAROLD W. PRICE.

REFERENCES CITED The following references, are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 930,419 Schlig Aug. 10, 1909 983,249 Parker Jan. 31, 1911 1,024,562 Eckert et a1 Apr. 30, 1912 1,449,269 Cronk Mar. 20', 1923 1,452,220 Schacht Apr. 17, 1923 1,469,579 Borden Oct. 2, 1923 1,533,531 White Apr. 14, 1925 1,916,892 Peterson July 4, 1933 1,993,015, Moorhouse Mar. 5, 1935 2,001,337 Wiedmaier May 14, 1935 2,113,860 Sanford et al Apr. 12, 1938 2,115,390 Lasley et al; Apr. 26, 1938 2,135,042 Rossman Nov. 1, 1938 2,192,078 Hautzenroeder' Feb. 27, 1940 2,316,503 Curtis Apr. 13, 1943 7 2,355,626 Bullard et a1 Aug. 15, 1944 FOREIGN PATENTS.

Number Country Date 23,139 Great Britain A. D. 1910 27,422 Great Britain A. D. 1902 335,871 Great Britain Oct. 2, 1930 487,504 Great Britain June 22, 1938 

